George tells Nina that his date for his high school prom (the one to whom he showed a "good time") was named Lucy Jane. In a display of her offbeat sense of humor, that is the name of screenwriter Wendy Wasserstein's daughter.
The singer at the wedding reception (credited only as "Wedding Singer") was played by Audra McDonald, arguably the most-lauded Broadway actor of her generation. By the time she filmed her bit part in this movie, McDonald had already won two Tony Awards (the highest honor for a Broadway performer). In June 2014, Audra McDonald won her sixth Tony Award (for Best Actress in a Play, for playing Billie Holiday in "Lady Day at Emerson's Bar & Grill"), which meant that she set a number of records: as of that win, she was the first performer, male or female, to win six competitive Tonys (Julie Harris also had six Tonys, but one was honorary). McDonald was also the first (and as of 2017, the only) performer ever to win Tonys in all four possible acting categories: Best Leading Performance in both a play and a musical and Best Supporting Performance in both a play and a musical. McDonald's first Tony was for Best Performance by a Featured Actress in a Musical for the 1994 revival of Carousel--which had been directed by Nicholas Hytner, also the director of The Object of My Affection.